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To find the percentage of a number, we first need to convert the percentage to a decimal.

This is done by dividing by 100,

130% = = 1.3

If the percentage had been 70%, the value would be 0.7If the percentage had been 45% the value would be 0.45 etc.

We then multiply our number by the percentage converted into a number, to get a final value.

For example,

70% of 200 = 0.7 x 200 = 140

Or,Percentage converted to decimal x starting number = final number

In this problem we have been given the final number, and must work out the starting value.

We know the percentage converted to a decimal is = 1.3We know the final number is 91

Again we use;

Percentage converted to decimal x starting number = final number1.3 x Starting number = 91This can be rearranged to give;Starting number = Starting number = 70